| - | 30 | x | − | 2100 | x | − | 36000 | = | 36750 |
| Left side of the equation = | - | 2130 | x | − | 36000 |
| - | 2130 | x | − | 36000 | = | 36750 |
| - | 2130 | x | = | 36750 | + | 36000 |
| - | 2130 | x | = | 72750 |
| - | 72750 | = | 2130 | x |
| 2130 | x | = | - | 72750 |
| x | = | - | 72750 | ÷ | 2130 |
| = | - | 72750 | × | 1 2130 |
| = | - | 2425 | × | 1 71 |
| x | = | - | 2425 71 |
| x | = | - 34.15493 |